Python’s Hidden Power: The Descriptor Protocol

Photo by Brandon Morgan on Unsplash

Have you ever wondered how Python interprets and executes your code? 🤔

Before your Python script runs, it goes through several transformations — from plain text to bytecode. One crucial step in this process is AST (Abstract Syntax Tree), a hidden yet powerful feature of Python that lets you analyze and modify code dynamically.

If you’ve never worked with AST before, buckle up! 🚀 This post will introduce you to the AST module, show you how Python parses code, and demonstrate real-world applications where AST manipulation can be a game-changer!

🔍 What is an Abstract Syntax Tree (AST)?

An Abstract Syntax Tree (AST) is a structured representation of your code, where Python converts your script into a tree-like format before executing it.

Think of AST as Python’s way of “understanding” your code before running it.

For example, the following Python code:

x = 2 + 3

is internally represented as this AST tree:

Assign
 ├─ Name (id='x')
 ├─ BinOp
 │   ├─ Num (2)
 │   ├─ Add
 │   ├─ Num (3)

Here’s a breakdown:
✔ Assign represents assignment (=)
✔ BinOp represents a binary operation (+)
✔ Num represents numbers (2, 3)
✔…